Drill-bit die



F. 1. LAIRD.

DRILL BIT DIE.

FILED OCT. 23, 1920.

Dec. 26, 1922.

gwuawroz f/M a. abfozvwqo Patented Dec. 26 1922..

time

FRANK J. Lanai); or MONTANA. v

, nnrnnsrr DIE.

Application and amber 2a, 1920. serial No. 4. .9.082.

To (all M /L077), it may concern.

Be it known that I, FRAN J. Linn), a citizen oi the United States residing at Butte. in the county of fiilierbow and State of Montana, have invented certain. new and useful Improvements in Drill-bit Dies, of which the following is a specification.

The present invention relates to drill. bit sharpeners and more particularly toa new and usetul improvement in drill bitdies of the character described in my application No. 397,036 filed July 17, 1920.

Th. general object of the present invention is a construction which allows one inaster die to be used for all shapes and sizes of drill bits and drill steel.

Another object is to reduce to a llllllllllllli] the amount of tool steel necessary to form and sharpen drill bits and still another ohject is to make each Wearing surface sepan 7 ate and removable and. independent from the other. i

For a full understanding of the invention reference is had to the, accompanying drawings in which- Fig. l is a sectional view eta die cmbodying the invention;

Fig. 2 is an end view thcreot;

Fig. .i is a transverse section through the inner bushing;

l igg 4 is a similar section through a modified form of bushing; and

Fig. 5 is a similar section. through another modified form of bushing.

In the drawings fl represents a split clamping die or master die which is preterably made of any suitable low priced material and 2 and 3 are bushing elements forming the component parts of What may mechanically be considered as a single split bushing.

The first or outer bushing 2 forms or moulds the drill steel and determines its size and shape, Whereas the second or back bushing holds or clamps the drill steel. The former is made oi. high grade material, prelerably l'iigz h carbon tool steel While the latter may be or dillcrent and lower grade material.

The clamping die 1 is formed to define in its outer portion a recess 4 and intermedilate this recess and the inner end a second recess 5 of smaller diameter than recess The shoulder resulting from the formation of the two recesses is preferably beveled.

end of bushing 3 reduced to form a tenon 9 Similarly theshoulderat theinner end of the recess 5 is beveled.

The outer bushing 2 has an undercut beveled shoulder 7 accurately fitting the shoulder at the end of the recess 4 and the bushing 3 has beveled edge 8 accurately fitting the shoulderjat the inner end of the recess 5.

The inner end of bushing 2 and the outer arepreferably provided h imtereng'i ng faces. form illustra ed, the. end

of zone bushing is and the end of the other bushingis inwardly recessed at 10 to receive the tenon 9. The justdescribed arrangement has the purpose to hold the bushings in place in the die When the bottom and steel tobe sharpened or ened steel from it. y

opening; 11 at the inner end of the die remove the, sharp- 1 is large enough to accommodate the drill steel of Whatever shape it may be. In the form shown in Figs. 1 and 2 the inner surface oi the bushings 2 and 3 is cylindrical to clamp a roi'ind drill shank. The surface =ci the opening;- ll. in this instance is or may be ii i ish with the inner surface of the bushrn' in l; the inner surface 12 isiorme'd to receive a square shank, While in F 5 the inner surface 13 is formed to receive a hexagonal shank. In either case the opening 11 is or .uchdiameter that the corners of the cross-sectional area of the shank fall Within surface of the opening 11.

The forming" surface 14 of the die has a double taper similar to the device described in my said application.

By the arrangement described one die 1 which may betermed a master die, may be used for all shapes and sizes of drill bits and drill steel. Either of the two bushings may be replaced When it has become useless Without affecting the other bushing or. the master die. This is of particular importance inasmuch as the quantity of high-carbon steel. necessary for drill sharpening is rcduced to a minimum.

I claim:

1. For use in drill bit sharpening machines, amaster die and a removable bushing consisting; of two parts in end to end relation. 21 forming part and a holding part.

2. For use in drill bit sharpening machines. a master and a removable bush- In the particular I top parts are separated to insertthe.

holding them the adjoining ends of said die, for

ing consisting of two parts in end to end relation, a forming part of high grade material-and a holding part of lower grade material.

8. For use in drill sharpening machines,

site ends of said parts and on the master holding the bushing to the die.

5, .The combination of a split master die for sharpening drill steel, a removable split bushing consisting of separate parts, a

forming part and a holding part, the adjoining ends of said parts being formed to have. interlocking engagement adapted to hold the parts in alignment and the opposite ends of the said parts having beveled shoulders co-operating with corresponding recesses in the die to hold the bushing to the die. a

6. For use in amaster die for sharpening drill steel, a bushing consisting of two parts in end to end relation, one of the parts of high grade material serving as a forming partand the other of said parts of lower grade material serving as a holding part.

7. For use in a master die for sharpening drill steel, a bushing consisting of a high grade steel part and a part of lower grade material, the adjoining ends having interlocking engagement adapted to hold the parts in alignment.

In testimony whereof, I affix my signature.

FRANK J. LAIRD. 

